Ragna and Jin will always be a variation of Sol and Ky, they're the main characters of their respective series.
Naoto and Sin are new to the BB/GG fighting games (They've been in other parts of BB/GG story before though)
They're also both the young, brash shonen-esque character who butts heads a lot with the main character.
I see the similarities, wasn't really surprised they did it.
However, yes. They're all pretty cool imo, and that Kagura-Johnny color is so good (Too bad Kagura isn't half as good as Johnny is in Revelator right now)
I'm in love with the Terumi-Zato color, personally.

(Edited:I double posted because fuck my Internet so I'll just edit this)
The whole GCOD/AF/EA cycle really makes people consider whether they want to burst or not...I think the only time worth bursting is if you're about to die in the last round due to all these changes, really.
Then again, I haven't had my hands on the game.

I really think EA emphasizes the importance of OD, specifically GCOD.
Things like Active Flow/Exceed Accel/GCOD are really important to characters who have a good overdrive and lack defensive options and is a game-changer for them more-so than characters with average OD's and/or available DPs.
Question, what characters do you reckon it'll be really important for? Also, how useful do you think it'd be for a character like Terumi?
I'm guessing Hakumen, Relius, Arakune are probably the ones who make use of EA/AF/OD the most in CF.